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Environment-friendly water-based drilling fluid suitable for shale gas horizontal well

A water-based drilling fluid, drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature resistance, low density, low blocking and inhibiting properties, etc., and achieve high temperature resistance. Performance, high density, high blocking and inhibiting effects

Active Publication Date: 2016-10-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects of low density, poor temperature resistance, low plugging and inhibition of existing water-based drilling fluids, and provide a kind of water-based drilling fluid that can obtain higher density and higher temperature resistance. Water-based drilling fluid with high performance, high plugging and inhibition

Method used

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  • Environment-friendly water-based drilling fluid suitable for shale gas horizontal well
  • Environment-friendly water-based drilling fluid suitable for shale gas horizontal well
  • Environment-friendly water-based drilling fluid suitable for shale gas horizontal well

Examples

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preparation example Construction

[0067] According to the present invention, in the preparation method of the modified silica nanoparticles, although the embodiment of step (1) may be to combine one of the monohydric alcohol, the coupling agent, and the monomer of the structure represented by the formula (1) One or more and one or more of the monomers of the structure shown in formula (2) are added to the reaction system together with the silica nanoparticles, or the mode of mixing in any step and then mixing together, for this The present invention is not particularly limited. However, in order to obtain more ideal modified silica nanoparticles after the contact reaction and the polymerization reaction, preferably, step (1) includes: firstly combining the monolithic structure represented by the formula (1). The monomer and the monomer of the structure represented by formula (2) are mixed (for example, at 10-40 ° C (preferably 20-30 ° C), stirring at 200-500 rpm (preferably 250-350 rpm) for 10-40 min (preferab...

Embodiment approach

[0074] According to a preferred embodiment of the present invention, the biomimetic wall-fixing agent contains a structural unit represented by formula (I):

[0075]

[0076] In formula (I), R 1 for hydrogen, -CH 2 COOR 3 ', -CH 2 COOR 3 , R 2 for hydrogen, and R 1 and R 2 at least one of n is an integer of 1 or more, and n R 5 each independently H or a group derived from dopamine and n R 5 At least one of which is a group derived from dopamine, R 4 is H or C 1 -C 10 Alkyl, R"' is H, -CH 2 COOR 3 ' or -CH 2 COOR 3 , and R 1 and R"' are not H, R at the same time 3 ' is hydrogen or alkali metal, R 3 is a group derived from dopamine.

[0077] The weight average molecular weight of the bionic wall-fixing agent may be 20000g / mol-150000g / mol, preferably 50000g / mol-100000g / mol.

[0078] According to the present invention, preferably, in formula (I), R 4 for C 2 -C 10 alkyl, more preferably C 2 -C 6 the alkyl group. R 4 Specific examples include, but...

specific Embodiment approach

[0093] According to a specific embodiment of the present invention, the preparation method of the biomimetic shale inhibitor comprises: in the presence of an inorganic acid catalyst, a condensation reaction of arginine and lysine is carried out, the amount of the arginine and the lysine The molar ratio of the amount of the amino acid is 0.2-6:1, and the condensation reaction conditions make the weight-average molecular weight of the biomimetic shale inhibitor to be 800-4000 g / mol.

[0094] According to the present invention, in the preparation method of the biomimetic shale inhibitor, the arginine can be L-type, D-type or a mixture of the two, and the lysine can be L-type or D-type or a mixture of both. L-arginine and L-lysine are preferably used.

[0095] According to the present invention, in the preparation method of the biomimetic shale inhibitor, the amounts of the arginine and lysine are not particularly limited, as long as the weight-average molecular weight of the con...

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Abstract

The invention relates to the field of petrochemical drilling, and discloses an environment-friendly water-based drilling fluid suitable for a shale gas horizontal well. The drilling fluid contains a nano plugging agent, a bionic wall fixing agent, a bionic shale inhibitor and a filling agent; the nano plugging agent is modified silicon dioxide nano-particles; the modified groups of the modified silicon dioxide nano-particles comprise modified acrylic copolymer chains; the bionic wall fixing agent is carboxymethyl chitosan of which the main chain is grafted with a group which is derived from dopamine; the bionic shale inhibitor consists of structural units of arginine and structural units of lysine; the filling agent consists of 1,600 to 2,500-mesh calcium carbonate, 1,050 to 1,500-mesh calcium carbonate and 500 to 1,000-mesh calcium carbonate in weight ratio of 1 to (0.55-6) to (0.55-6). According to the drilling fluid disclosed by the invention, high temperature resistance, high plugging property, high inhibiting property and high environment friendliness can be achieved, and particularly high density can be achieved, so that the drilling fluid is suitable for shale gas mining.

Description

technical field [0001] The invention relates to the field of petrochemical drilling, in particular to an environment-friendly water-based drilling fluid suitable for shale gas horizontal wells. Background technique [0002] With the increasing energy consumption, the development and utilization of unconventional energy such as shale gas and shale oil has gradually received attention. my country's proven shale oil and gas reservoirs have huge reserves and high exploration and development value. At present, shale gas exploitation mainly adopts the method of long-section horizontal well and multi-stage staged fracturing to increase the output of single well and enhance the value of industrial exploitation. Due to the strong water sensitivity and well-developed fractures of shale formations, complex situations such as collapse and diameter reduction are prone to occur during the drilling process. Therefore, the main technical difficulty faced by the drilling and completion flui...

Claims

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Application Information

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IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/10C09K2208/12C09K2208/18C09K2208/34
Inventor 蒋官澄张县民贺银博高德利伍贤柱杨丽丽马光长屈刚赵利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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